Try this:
aggregate(height ~ class + group + name, data = myData, FUN = mean)
On Wed, Oct 6, 2010 at 4:13 PM, Geoffrey Smith <g...@asu.edu> wrote:
> Hello, I am having trouble getting the output from the tapply function
> formatted so that it can be made into a nice table. Below is my question
> written in R code. Does anyone have any suggestions? Thank you. Geoff
>
> #Input the data;
> name <- c('Tom', 'Tom', 'Jane', 'Jane', 'Enzo', 'Enzo', 'Mary', 'Mary');
> year <- c(2008, 2009, 2008, 2009, 2008, 2009, 2008, 2009);
> group <- c('A', 'A', 'B', 'B', 'A', 'A', 'B', 'B');
> class <- c(0, 0, 0, 0, 1, 1, 1, 1);
> height <- c(62, 63, 59, 58, 67, 66, 70, 71);
>
> #Combine the data into a data frame;
> myData <- data.frame(name, year, group, class, height);
> myData;
>
> #Calculate the mean of height by class, group, and name;
> tapply(myData$height, data.frame(myData$class, myData$group, myData$name),
> mean);
>
> #The raw output from the tapply function is fine, but I would;
> #really like the output to look like this;
> # class group name mean
> # 0 A Tom 62.5
> # 0 B Jane 58.5
> # 1 A Enzo 66.5
> # 1 B Mary 70.5
>
> --
> Geoffrey Smith
> Visiting Assistant Professor
> Department of Finance
> W. P. Carey School of Business
> Arizona State University
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
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> PLEASE do read the posting guide
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>
--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
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